Family Matters - Season 1 Episode 19 -

A bully named Bull Watson terrorizes Urkel into giving up his lunch money. Urkel wants Eddie to stick up for him, but gets no sympathy. That is, Rodney witnesses Urkel sticking up for himself and Bull threatening him with serious injury if he refuses to hand over his lunch money. After going to Carl for some advice, Eddie decides to fight Bull ... and easily defeats him.